opt={
    backgroundColor: '#ffffff',
    title: {
        text: '${title}',
        left: 25,
        top: 10,
        textStyle: {
            color: '#000000',
            fontSize: 20,
            fontWeight: 'bold'
        }
    },
    legend: {},
    tooltip: {},
    dataset: {
        dimensions: ['product', '2015', '2016', '2017'],
        source: ${source}
    },
    xAxis: {type: 'category'},
    yAxis: {},
    series: [
        {
            type: 'bar',
            label: {
                show: true,
                position: 'top',
                formatter: function (params) {
                    return params.value[2015] +'亿';
                }
            }
        },
        {
            type: 'bar',
            label: {
                show: true,
                position: 'top',
                formatter: function (params) {
                    return params.value[2016] +'亿';
                }
            }
        },
        {
            type: 'bar',
            label: {
                show: true,
                position: 'top',
                formatter: function (params) {
                    return params.value[2017] +'亿';
                }
            }
        }
    ]
}